symfonic.devtools.archcheck.boundaries

boundaries

Import-boundary checks derived from the allowed dependency matrix.

Implements LAY-ADR SS7 rules 1, 3, and 5: every yes/port/root/ no cell enforced at module level, root verified lazy and confined to sanctioned composition roots (SS5), kernel purity (stdlib + kernel.contracts only, plus the plan's must_not_import names), and layer-mapping coverage for every module under an enforced namespace.

Every rule here fails CLOSED. An import the matrix cannot rule on -- because the TARGET carries no layer -- is a violation attributed to the importer (kernel-purity from a kernel layer, unmapped-import from any other), not a silent skip; see :func:_check_unmapped.